Connected: An Internet Encyclopedia
RFC 791 - 2.4. Gateways

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### 2.4. Gateways

Gateways implement internet protocol to forward datagrams between networks. Gateways also implement the Gateway to Gateway Protocol (GGP) [7] to coordinate routing and other internet control information.

In a gateway the higher level protocols need not be implemented and the GGP functions are added to the IP module.

                       +-------------------------------+
                       | Internet Protocol & ICMP & GGP|
                       +-------------------------------+
                               |                 |
                     +---------------+   +---------------+
                     |   Local Net   |   |   Local Net   |
                     +---------------+   +---------------+

                               Gateway Protocols

                                   Figure 3.

Next: 3. SPECIFICATION

Connected: An Internet Encyclopedia
RFC 791 - 2.4. Gateways